Replies

Although the information provided above is not enough to give proper suggestions, still I would like to know if you have configured "ip helper-address" command on Router2 & Router3 pointing towards Router1 (which as per the description is the DHCP server)

This "ip helper-address" command need to be configured on the Vlan/Interface assigned for third Floor users having an ip address for which there is a DHCP pool on Router 1.

For better solution, please provide more info about the profile and configuration of the routers